CN102901717A - Laser-induced breakdown spectroscopy-based portable handheld soil heavy mental detection device - Google Patents
Laser-induced breakdown spectroscopy-based portable handheld soil heavy mental detection device Download PDFInfo
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- CN102901717A CN102901717A CN2012101912208A CN201210191220A CN102901717A CN 102901717 A CN102901717 A CN 102901717A CN 2012101912208 A CN2012101912208 A CN 2012101912208A CN 201210191220 A CN201210191220 A CN 201210191220A CN 102901717 A CN102901717 A CN 102901717A
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Abstract
The invention discloses a laser-induced breakdown spectroscopy-based portable handheld soil heavy mental detection device. The laser-induced breakdown spectroscopy-based portable handheld soil heavy mental detection device comprises an optical probe part and a signal acquisition and control part. The optical probe part is characterized in that a laser emission head in a housing emits laser; and the emitted laser passes through a series of lenses, then is coupled to optical fibers and then is input into a spectrograph of the signal acquisition and control part. An optical signal is transformed into an electrical signal and then is input into a computer. The computer stores and processes the input electrical signal. The laser-induced breakdown spectroscopy-based portable handheld soil heavy mental detection device adopts an off-axial aspherical mirror so that height calibration and turning of a light beam emitted by plasma are carried out simultaneously without a color difference so that coupling of follow-up light beams to optical fibers is guaranteed. The laser-induced breakdown spectroscopy-based portable handheld soil heavy mental detection device adopts the lenses to realize laser beam conversion so that output energy of the laser emission head is reduced and thus the damage on a sample in detection is reduced. The laser-induced breakdown spectroscopy-based portable handheld soil heavy mental detection device has a high system integration level, a small volume, light weight and a low cost, is convenient for carrying and operation, and can be realized easily.
Description
Technical field
The present invention relates to the environmental optics detection field, relate in particular to a kind of portable hand-holding type heavy metal-polluted soil sniffer based on Laser-induced Breakdown Spectroscopy.
Background technology
Existing heavy metal-polluted soil based on Laser-induced Breakdown Spectroscopy detects still take spot sampling, lab analysis method as main, no matter its optical system, institute's employing spectrometer or computer control system, volume is all larger and heavy, can only from the scene fetch pedotheque and processing after could for detection of.Can carry out at present small and exquisite, the light heavy metal-polluted soil detection system of on-the-spot in situ detection also seldom.And the scope of heavy metal-polluted soil plasma is generally between 300nm ~ 500nm, even the optic probe of Laser-induced Breakdown Spectroscopy occurred being used for, but the design of these probes does not improve the efficient of accepting of plasma signal for the characteristic spectrum wave band of heavy metal-polluted soil, so these probes are not suitable for the detection of on-site soil heavy metal yet.
Summary of the invention
The object of the invention is exactly in order to remedy the defective of prior art, and the portable hand-holding type heavy metal-polluted soil sniffer based on Laser-induced Breakdown Spectroscopy that a kind of miniaturization, quality are light, be easy to carry and operate is provided.
The present invention is achieved by the following technical solutions:
A kind of portable hand-holding type heavy metal-polluted soil sniffer based on Laser-induced Breakdown Spectroscopy includes optic probe part and signals collecting and control section;
Described optic probe partly comprises a housing, place a laser instrument emitting head at enclosure interior one end, there is a control laser instrument emitting head to transfer the on-off circuit of Q output to be arranged on enclosure interior edge, the hand switch button is arranged on the described on-off circuit, described hand switch button protrudes in hull outside, the place ahead light path at described laser instrument emitting head Emission Lasers is disposed with convex lens one and off-axis aspheric mirror, the other end of housing has aperture, laser that described laser instrument emitting head sends converges and sees through the surface that shines testing sample behind the off-axis aspheric mirror by described aperture through convex lens one, testing sample is punctured and the emission plasma spectrometry, plasma spectrometry turn 90 degrees through the reflection folding of described off-axis aspheric mirror, highly collimated simultaneously, incide the lens combination that is positioned at the off-axis aspheric mirror below, described lens combination is by concavees lens one, convex lens two and concavees lens two are arranged in order composition, plasma spectrometry pools minimum hot spot through after the lens combination, reach the optical fiber head that an optical fiber one end is placed in minimizing position at spot radius, the spectral signal of plasma spectrometry is by the optical fiber head coupled into optical fibres; In addition a side of housing be fixed with a photodetector and be positioned at described off-axis aspheric mirror above;
Described signals collecting and control section are comprised of spectrometer, trigger circuit, power module and computer, the input end of described power module connects described on-off circuit, output terminal connects described laser instrument emitting head, the signal that described photodetector is surveyed is inputted into described trigger circuit, the output terminal of trigger circuit links to each other with described spectrometer, spectrometer also links to each other with described computer, and the optical fiber head of the other end of described optical fiber is connected on the spectrometer.
Be coated with the broadband deielectric-coating on the described off-axis aspheric mirror; The material of described convex lens one is BK7; The material of described convex lens two is FK51; Described concavees lens one and two material are BaK1; Described laser instrument emitting head length is less than 11cm, and width is less than 3cm, and height is less than 4cm, and weight is less than 100 grams.
Principle of work of the present invention is: press the hand switch button, the turn on-switch circuit, on-off circuit will transfer the Q electric signal to input into power module, power module will transfer the Q electric signal to input in the laser instrument emitting head again, regulate the laser that the laser instrument emitting head sends, laser carries out conversion by convex lens one, energy greater than 90% converges to the testing sample surface with testing sample puncture and emission plasma spectrometry after seeing through the off-axis aspheric mirror that is coated with the broadband deielectric-coating, reflection folding through off-axis aspheric mirror turn 90 degrees, and highly collimate, enter lens combination, lens combination can pool minimum hot spot in 300 nanometers to the light in 500 nanometer range with wavelength coverage, this spot radius is less than 5 μ m, and as shown in Figure 2, spot coupling advances optical fiber; In addition, the faint laser parasitic light signal of off-axis aspheric mirror reflection is collected by photodetector, and change into electric signal and input into trigger circuit, the process trigger circuit are converted into the TTL high level signal and input spectrometer and trigger its work, sequential between trigger circuit output signal and the spectrometer gate-control signal as shown in Figure 4, spectrometer opens time-delay according to pre-set door and the gate-width time is carried out work, in addition, optical fiber is input to spectrometer with the plasma light signal of collecting, spectrometer is converted into electric signal with light signal and is input in the computer, by final storage and the demonstration that realizes plasma signal of the processing of computer.
Heavy metal-polluted soil is surveyed spectrometer resolution is only required that reaching 0.1nm gets final product, and wavelength coverage is at 300 ~ 500nm.And reach this resolution, in this wavelength band, volume is little, quality is light commercialization of spectrometer, and low price is easily bought.Along with popularizing of panel computer and palm PC, volume and the quality of computing machine are more and more less, and performance is more and more higher, and price is more and more cheap, develop corresponding spectrometer software according to the operating system of panel computer or palm PC, can realize the reading of spectrometer data, Storage and Processing.
Advantage of the present invention is:
1, the whole system integrated level is high, volume is little, lightweight, be convenient for carrying and operate, cost is low, and easily
In realization.
2, adopt off-axis aspheric mirror in the optic probe of system, the light beam steering that plasma can be sent same
Shi Jinhang highly collimates, and does not produce aberration, advances optical fiber for follow-up light beam coupling and provides safeguard.
3, adopt the different lens combination of material to the highly collimated light bundle of 300 ~ 500nm in the optic probe of system
Converge, so that the minimum value of spot radius is less than 5 μ m, as shown in Figure 2.Because the inner core core diameter of general single-mode fiber is between 8 ~ 10 μ m, so this lens combination can so that nearly all light beam coupling is advanced optical fiber, improve the efficient of signal collection greatly.
4, in the optic probe of system owing to having improved the efficient of accepting of plasma signal, and adopt lens
To laser beam transformation, the output energy of laser instrument emitting head can reduce, thereby has reduced in the testing process damage to sample.
5, in the optic probe of system owing to having improved the receiving efficiency of plasma signal, can reduce optics
The relative aperture of system, when reducing lens opening reduction system volume also so that operating distance is larger, thereby the sputter when having reduced sample by laser action is to the pollution of optic probe.
Description of drawings
Fig. 1 is optic probe part schematic diagram among the present invention.
Fig. 2 after to be plasma spectrometry through lens combination converge at the point range figure of optical fiber head porch.
Fig. 3 is signals collecting and control section schematic diagram.
Fig. 4 is trigger circuit output signal and gating circuit signal timing diagram.Among the figure, the spectrometer door leaves time-delay and is T1, and gate-width is T2.
Fig. 5 is the schematic diagram of integral body of the present invention.
Embodiment
As shown in Figure 5, a kind of portable hand-holding type heavy metal-polluted soil sniffer based on Laser-induced Breakdown Spectroscopy includes optic probe part and signals collecting and control section;
As shown in Figure 1, described optic probe partly comprises a housing 11, place a laser instrument emitting head 1 at housing 11 inner ends, there is a control laser instrument emitting head 1 to transfer the on-off circuit 9 of Q output to be arranged on housing 11 internal edge places, on the described on-off circuit 9 hand switch button 10 is arranged, described hand switch button 10 protrudes in housing 11 outsides, the place ahead light path at described laser instrument emitting head 1 Emission Lasers is disposed with convex lens 1 and off-axis aspheric mirror 3, the other end of housing 11 has aperture, laser that described laser instrument emitting head 1 sends converges and sees through the surface that shines testing sample 12 behind the off-axis aspheric mirror 3 by described aperture through convex lens 1, testing sample 12 is punctured and the emission plasma spectrometry, plasma spectrometry turn 90 degrees through the reflection folding of described off-axis aspheric mirror 3, highly collimated simultaneously, incide the lens combination that is positioned at off-axis aspheric mirror 3 belows, described lens combination is by concavees lens 1, convex lens 25 and concavees lens 26 are arranged in order composition, plasma spectrometry pools minimum hot spot through after the lens combination, reach the optical fiber head 7 that an optical fiber one end is placed in minimizing position at spot radius, the spectral signal of plasma spectrometry is by optical fiber head 7 coupled into optical fibres; In addition a side of housing 11 be fixed with a photodetector 8 and be positioned at described off-axis aspheric mirror 3 above;
As shown in Figure 2, described signals collecting and control section are comprised of spectrometer 17, trigger circuit 14, power module 15 and computer 16, the input end of described power module 15 connects described on-off circuit 9, output terminal connects described laser instrument emitting head 1, the signal that described photodetector 8 is surveyed is inputted into described trigger circuit 14, the output terminal of trigger circuit 14 links to each other with described spectrometer 17, spectrometer 17 also links to each other with described computer 16, and the optical fiber head 18 of the other end of described optical fiber is connected on the spectrometer 17.
Be coated with the broadband deielectric-coating on the described off-axis aspheric mirror 3; The material of described convex lens 1 is BK7; The material of described convex lens 25 is FK51; Described concavees lens 1 and 26 material are BaK1; Described laser instrument emitting head 1 length is less than 11cm, and width is less than 3cm, and height is less than 4cm, and weight is less than 100 grams; On the described on-off circuit 9 hand switch button 10 is arranged.
Claims (4)
1. the portable hand-holding type heavy metal-polluted soil sniffer based on Laser-induced Breakdown Spectroscopy is characterized in that: include optic probe part and signals collecting and control section;
Described optic probe partly comprises a housing, place a laser instrument emitting head at enclosure interior one end, there is a control laser instrument emitting head to transfer the on-off circuit of Q output to be arranged on enclosure interior edge, the hand switch button is arranged on the described on-off circuit, described hand switch button protrudes in hull outside, the place ahead light path at described laser instrument emitting head Emission Lasers is disposed with convex lens one and off-axis aspheric mirror, the other end of housing has aperture, laser that described laser instrument emitting head sends converges and sees through the surface that shines testing sample behind the off-axis aspheric mirror by described aperture through convex lens one, testing sample is punctured and the emission plasma spectrometry, plasma spectrometry turn 90 degrees through the reflection folding of described off-axis aspheric mirror, highly collimated simultaneously, incide the lens combination that is positioned at the off-axis aspheric mirror below, described lens combination is by concavees lens one, convex lens two and concavees lens two are arranged in order composition, plasma spectrometry pools minimum hot spot through after the lens combination, reach the optical fiber head that an optical fiber one end is placed in minimizing position at spot radius, the spectral signal of plasma spectrometry is by the optical fiber head coupled into optical fibres; In addition a side of housing be fixed with a photodetector and be positioned at described off-axis aspheric mirror above;
Described signals collecting and control section are comprised of spectrometer, trigger circuit, power module and computer, the input end of described power module connects described on-off circuit, output terminal connects described laser instrument emitting head, the signal that described photodetector is surveyed is inputted into described trigger circuit, the output terminal of trigger circuit links to each other with described spectrometer, spectrometer also links to each other with described computer, and the optical fiber head of the other end of described optical fiber is connected on the spectrometer.
2. the portable hand-holding type heavy metal-polluted soil sniffer based on Laser-induced Breakdown Spectroscopy according to claim 1 is characterized in that: be coated with the broadband deielectric-coating on the described off-axis aspheric mirror.
3. the portable hand-holding type heavy metal-polluted soil sniffer based on Laser-induced Breakdown Spectroscopy according to claim 1, it is characterized in that: the material of described convex lens one is BK7; The material of described convex lens two is FK51; Described concavees lens one and two material are BaK1.
4. the portable hand-holding type heavy metal-polluted soil sniffer based on Laser-induced Breakdown Spectroscopy according to claim 1 is characterized in that: described laser instrument emitting head length is less than 11cm, and width is less than 3cm, and height is less than 4cm, and weight is less than 100 grams.
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| CN103278480A (en) * | 2013-04-26 | 2013-09-04 | 中国科学院安徽光学精密机械研究所 | Laser-induced breakdown spectroscopy-based hand-held solid waste heavy metal detection probe |
| CN103411930A (en) * | 2013-07-26 | 2013-11-27 | 中国科学院安徽光学精密机械研究所 | Laser-induced breakdown spectrometry continuous detection device and method for heavy metal of water body |
| CN104007090A (en) * | 2014-05-27 | 2014-08-27 | 四川大学 | Portable elementary composition analysis device based on laser-induced breakdown spectroscopy technology |
| CN108303380A (en) * | 2018-01-26 | 2018-07-20 | 信阳农林学院 | A kind of optical spectrum analyser for analyzing different types of sample |
| CN108459012A (en) * | 2017-12-28 | 2018-08-28 | 中国科学院合肥物质科学研究院 | Portable laser plasma spark electric discharge component spectrum detecting system |
| CN109580556A (en) * | 2019-01-08 | 2019-04-05 | 宁波谱泰克科学仪器有限公司 | The detection ambient pressure control structure of Handheld laser induced breakdown spectrograph |
| CN112748232A (en) * | 2020-12-22 | 2021-05-04 | 中国科学院合肥物质科学研究院 | Real-time detection system for in-situ heavy metal distribution of soil profile |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103278480A (en) * | 2013-04-26 | 2013-09-04 | 中国科学院安徽光学精密机械研究所 | Laser-induced breakdown spectroscopy-based hand-held solid waste heavy metal detection probe |
| CN103411930A (en) * | 2013-07-26 | 2013-11-27 | 中国科学院安徽光学精密机械研究所 | Laser-induced breakdown spectrometry continuous detection device and method for heavy metal of water body |
| CN103411930B (en) * | 2013-07-26 | 2015-06-03 | 中国科学院安徽光学精密机械研究所 | Laser-induced breakdown spectrometry continuous detection device and method for heavy metal of water body |
| CN104007090A (en) * | 2014-05-27 | 2014-08-27 | 四川大学 | Portable elementary composition analysis device based on laser-induced breakdown spectroscopy technology |
| CN104007090B (en) * | 2014-05-27 | 2016-06-08 | 四川大学 | Portable element composition analysis device based on LIBS |
| CN108459012A (en) * | 2017-12-28 | 2018-08-28 | 中国科学院合肥物质科学研究院 | Portable laser plasma spark electric discharge component spectrum detecting system |
| CN108303380A (en) * | 2018-01-26 | 2018-07-20 | 信阳农林学院 | A kind of optical spectrum analyser for analyzing different types of sample |
| CN109580556A (en) * | 2019-01-08 | 2019-04-05 | 宁波谱泰克科学仪器有限公司 | The detection ambient pressure control structure of Handheld laser induced breakdown spectrograph |
| CN109580556B (en) * | 2019-01-08 | 2023-07-04 | 宁波谱泰克科学仪器有限公司 | Detection environment air pressure control structure of handheld laser-induced breakdown spectrometer |
| CN112748232A (en) * | 2020-12-22 | 2021-05-04 | 中国科学院合肥物质科学研究院 | Real-time detection system for in-situ heavy metal distribution of soil profile |
| CN112748232B (en) * | 2020-12-22 | 2023-03-10 | 中国科学院合肥物质科学研究院 | Real-time detection system for in-situ heavy metal distribution of soil profile |
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